Tubular hot-air furnace



(No Model.)

F. SHRIVER. 'TUBULAR'HOT AIR FURNACE.

N o.361,841. Patent Apr. 26, 18 87 TT TTTTTTT TTTT WITNESSES: .Z 1: INVENTOR v 44 w M- 1 'grTonN'fiygg N. PETERS. Phulu-ljuwgnphun Wahinflnn, EC.

UNITED STATES PATENT QFFICE.

FREDERICK SHRIVER, OF GRAND RAPIDS, MICHIGAN.

TUBULAR HOT-AIR FURNACE.

QPBCIFICATION forming part of Letters Patent No. 361,841, dated April 26, 1887.

(No model.)

.To all whom it may concern.-

Be it known that I, FREDERICK SHRIVER,

of Grand Rapids, Kent county, and State of Michigan, have invented a new and useful Inlprovement in Tubular Hot-Air Furnaces, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forminga part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

Figure l is a longitudinal vertical central section of my invention. Fig. 2is a sectional front elevation of the same, taken through the line mm, Fig. 1.

The object of this invention is to provide tubular hot-air furnaces constructed in such a manner that they can be readily cleaned and repaired, and which shall be simple in construction, effective in operation, and durable in use. v

The invention consists in the construction and combination of various parts of the furnace, as will be hereinafter fully described.

A represents the combustion-chamber, which is made of right-angled or elbow form of cylin-. drical sections.

The shell of the chamber A is made of plateiron, and the lower part of the vertical section is lined with fire brick B, to form afire-chamher, and rests upon a cast-iron bed-plate, O, which is made with a flange or groove to receive the lower edge of the said shell, so that the joint will be gastight.

The bed-plate 0 supports the fire-grateD and rests upon a brick foundation, E, which forms the wall of the ash-pit F.

In the upper part of the front of the vertical section of the co mbustion-chamber A is formed an opening through which fuel is introduced, and which is closed by adoor, G.

The diagonal edges of the two sections of the combustion-chamber A are overlapped and secured to each other by rivets, as indicated in Fig. 1.

The end of the horizontal section of the combustion-chamber A is closed with a cast-iron head, H, which has aforwardly-projecting annular flange, 1, around its edge, to fit into the end of the said section of the combustion-chamber and receive the bolts or rivets by which the said head is secured to the said shell. The head H is formed with a series of annular concentric steps projecting from its other or rear side, through which are formed openings surrounded by collars J, to receive the forward ends of the tubes K. The tubes K are made of wrought-iron and are driven tightly upon the collars J, so as to form gas-tight joints. Into the-rear ends of the tubes K are driven the collars L, formed around the openings in the steps of the cast-iron head M, which has a rearwardly-projecting flange, N, around its edge, to receive the plate-iron shell of the smoke-chamber O, and is secured to the said shell by bolts or rivets.

The heads H M are made of exactly the same shape and size, so that they can be exchanged, and are made in step form to strengthen them and prevent them from cracking.

The rear end of the smoke-chamber O is closed by a cast-iron head, I, made concave.

upon theinner side and convex upon the outer side. The head P has an annular flange, Q, upon the outer part of its concave side, to fit into the shell of the smoke-chamber O, and is secured to the said shell by bolts or rivets. In the center of the head P is formed a circular opening, which is surrounded by an outwardly-projecting collar, R, provided with a cover, S. The opening through the head P serves as a cleaning-door, and also to receive the end of a smoke-pipe, as indicated in dotted lines in Fig. 1, when itis desired to have a direct draft.

The brick work inclosing the furnace is made with a rear opening, which is closed by a shutter, T, made of galvanized iron, so that by removing the said shutter access can be had to the furnace for repairing it without taking down the brick-work.

With an opening in the bottom of the shell of the smoke-chamber O is connected by bolts or rivets the flanged upper end of the smokeconnection U, in the inner and outer sides of the lower part of which are formed openings surrounded by collars V XV. With the outer collar, WV, is connected the end of a short pipe, X, the outer end of which is closed by a cover, Y, and which serves as an opening through which the upper arm of the smoke-pipe can be cleaned and the ashes and cinders falling from the smoke-chamber O can be removed; With the inner co1lar,V,of the smoke-connection U is connected the end of the upper arm of the smoke-pipe Z, which is made in U shape, and the end of the lower'arm of which is designed to be connected with a chimney or smoke-stack. \Vith an opening in the smokepipe Z, at its bend, is connected the end of a short pipe, a, the other end of which is connected with acollar, 1), formed around an opening in the rear part ofthe bed-plate O. The pipe or is provided with a damper, 0, so that when the grate is to be shaken, by opening the damper c the fine ashes will be drawn through the small pipe a into the smoke-pipe Z, and will thus be prevented from escaping into the room in which the furnace is set. The cold air to be heated enters through the openings (1 in the lower parts of the side walls of the inclosing brickwork, circulates around the smoke-pipe Z, the tubes K, and the combustion-chamber A, and passes through the pipes e to the rooms to be warmed.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent,-is-- 1. In a hot-air furnace, the combination, with the combustion-chamber A, the smoketubes K, and the smoke-chamber O, of the perforated heads H M, formed with concentric steps and provided with flanges to engage with the shells of the said chambers and with collars to engage with the said tubes, substantially as herein'shown and described.

2. In a hot-air furnace, the combination, with the smoke-chamber and the ash pit, of the return smoke-flue with one arm connected to the said cha1nber,and apipe-connection connecting said return-flue at the point of union between its arms with the ash-pit, said pipe- 0 connection being provided with a valve, substantially as and for the purpose set forth.

FREDERICK SHRIVER Vitnesses:

F. E. PULTE, E. D. BROOK. 

